[Increased tryptophan supplement in the feed might suppress aggressions in chickens]

abnormal behaviour aggressive behaviour animal performance body weight comportamiento agresivo comportamiento anormal comportement agressif comportement alimentaire comportement anormal composition globale damage dosage effects estres feathers feeding habits gallina ponedora layer chickens noruega norway performance animale peso corporal piensos medicinales plumas plume poids corporel poule pondeuse proximate composition stress suplementos supplements triptofano tryptophan tryptophane